Diego Simeone hailed the performance of striker Diego Costa in Atletico Madrid’s 3-0 win away to Austria Vienna in UEFA Champions League Group G play onTuesday, while also warning his players against complacency. Costa scored twice on the night, including a brilliant solo run for his first goal. The win left Atleti comfortably at the top of Group Gwith nine points from three games, five points ahead of second-place Zenit St Petersburg, which won 1-0 away to FC Porto.